Constructed for defense, this fort oversaw the dress rehearsal for one of the largest invasions in history.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

A open air theatre built on a cliff by an eccentric British woman.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

An encyclopedic collection of mammal penises.

This stunning concert hall has become a symbol of Iceland's national recovery.

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

These picturesque ruins crumble beautifully into the ocean.

This stone harbor was key to Carnlough's limestone industry.

Built in 1547, these ruins lie on a rocky promontory in Ballintoy jutting into the wild ocean waters below.

Amazing vistas await visitors to this stretch of coastline.

These engineering masterpieces are a dominant feature of the Belfast skyline.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

This massive monument has been telling the time for 150 years—at a slight angle.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

The lake that fills and empties itself at random.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

This World War II relic let Allied pilots know they were entering neutral airspace.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

Petrified footprints of one of the very first vertebrates to walk on land.